Coal-puncher-sharpening machine.



J. B. & W. W. WORD. GOAL PUNGHER SHARPENING MAUHINE.

APPLICATION FI LED FEB. 20,1909.

Patented Nov. 30, 1909.

. WITNESSES.

J. B. & W. W. WORD. COAL PUNGHER SHARPENING MACHINE. APPLIOATION FILEDPEB.20, 1909.

941,484. Patented Nov. 30, 1909.

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JOHN B. WORD AND WILLIAM W. WORD, OF SAN FRANCISCO, CALIFORNIA,ASSIGNORS TO WORD BROS, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OFCALIFORNIA.

COAL-PUNCHER-SHARPENING MACHINE.

Specification of Letters Patent.

Patented Nov. 30, 1909.

To all whom it may concern:

Be it known that we, JOHN B. WORD and WILLIAM W. WORD, citizens of theUnited States, residing at the city and county of San Francisco andState of California, have invented certain new and useful Improvementsin Coal Puncher Sharpening Machines, of which the following is aspecification.

Our invention relates to that class of toolsharpening machines, in whichthe operation is efiected by and between suitable dies, to one of whichpneumatic power is applied to effect the necessary pressure on the toolsur-' faces.

Our invention is particularly intended for the sharpening of those toolsused in coalmining, for undercutting the ledge, and commonly known ascoal-punchers or coalpuncher picks. These tools are fish-tail like bitswhich, from the hard usage to which they are subjected, quickly getdull. Their cutting surfaces, from the shape of the tool, are ratherhard to reach and to sharpen by ordinary methods and means; and it,therefore, becomes a desirable object to provide a means by which theycan rapidly and economically berestored to shape and their edgessharpened.

This is the object of our invention, and to this end, our inventionconsists in the novel dies and in their pneumatic operation and control,which we shall hereinafter fully describe by reference to theaccompanying drawings in which Figure 1 is a side-elevation of ourmachine. Fig. 2 is a front-view of the same. Fig. 3 is a section on linew-w of Fig; 5. Fig. 4 is a longitudinal section of the body of thevalve-casing. Fig. 5' is a longitudinal sectional elevation ofthecontrolling-valve of the machine. Fig. 6 is a perspective view of thevalve proper. Fig. 7 is a front view of the dies. Fig. 8 is a section ofthe same on the line yy of Fig. 7, the lower or anvil die being shown inside-elevation. Fig. 9 is a view of the coal-puncher, which is the toolto be sharpened by our machine.

1 is a stand for the machine.

2 is the base plate, 3 is the anvil and 4 is the column of the machine.The column 4 carries a pneumatic hammer, of which 5 is the cylinder. Inthe lower end of this cyllnder is fitted to slide the stem 6 of theupper or hammer die 7. The upper end of the die stem lies in position tobe struck by the hammer, within the cylinder.

Seated in the anvil is the lower or anvildie 8. Secured to the side ofthe anvil is the casing 9 of the controlling valve, to be presentlydescribed. The stem 10 of this valve extends through the lower end ofthe casing 9 and is connected with a rod 11, the lower end of which isconnected with a crank 12 on a rock-shaft 13, to which is fitted atreadle 14.

15 is the inlet for the compressed air to the valve casing 9.

16 is the outlet connection from the casing to the cylinder 5 of thepneumatic hammer.

17 in Figs. 3, 4 and 5, is the outlet to a passage 18, shown in dottedlines in Fig. 1, made in the anvil, the upper end of this passageopening under the lifting pin 19, seated in the anvil. The upper end ofthis pin bears under a lug 20 on the back of the ham1ner-die 7.

In the valve casing 9, between the outlets 16 and 17 is an exhaust port21, seen in Figs. 4 and 5.

The valve 22, as seen in Figs. 3, 5 and 6 is a sector, formed with asquare groove 22, to fit, without turning, upon the flattened sides ofan enlarged portion 23 of the stem 10. This portion 23, has its fiatsides, as seen in Fig. 5, terminating short of the ends, so thatend-collars 23 are left, between which the valve lies. The valve istherefore moved with the stem, but does not turn on it. In the peripheryof the valve is formed a port 24. The inner end of the valve-stem isprovided With a piston 25, and the'upper or cap end 9 of thevalve-casing has air openings 26.

When the compressed air is turned into the casing 9, through its inlet15, it will, by acting on the piston 25, force the valve over to theposition shown in Fig. 5, in which the connection 16 to the hammercylinder 5 is cut off, and the connection 17 to the liftingpin 19 isopen. The air thus elevates said pin 19, which raises the hammer-die 7and holds it up. Now, upon pressing down the heel of the treadle 14, thevalve stem 10 is drawn down, and the valve moves to a position in whichits port 24 joins the lifting-pin connection 17 and the exhaust port 21,thereby permitting the air to exhaust from under the pin and free it;and in this position of the valve the connection 16 to the hammercylinder is open, so that the comand admitted under the lifting pin,which thereby raises the hammer die and holds it up.

The anvil-die S, is a block formed on its upper surface with flat planes27 separated by a rectangular central shoulder 28 which rises from thesurface and extends from front to back, as seen clearly in Figs. 7 and8. The hammer-die 7, which is best seen in said Figs. 7 and S, has inits under surface a central groove 29, of rectangular section andextending from front to back. The under surface of the die forms, in themain, fiat planes 30, but these at their forward ends on each side ofthe central groove 29 are beveled to form the triangular upwardlyconverging planes 31, which intersect the planes of the grooveside-walls, and the planes of the bottom and front of the die.

The upper wall of the central groove 29, is, at its back, a straightplane 32, as seen in Fig. 8. At its front it is beveled to formforwardly diverging inclined planes 33, and these are further beveled ata greater angle to form the forwardly diverging, upwardly converginginclined planes 34.

In the face of the die 7, directly above the planes 34 is a recess 35.

In Fig. 9, the coal-puncher to be sharpened is designated by 36. It hastwo prongs 37 which are beveled down as seen at 38, to form the cuttingedges. The back of these prongs is substantially flat, the sharpeningbeing only from one side.

The operation of sharpening the tool 36 on our machine is as follows:The end of the tool having been heated red hot is first laid on itsback on one of the flat-planes 27 of the anvil-die, with one side firmlypressed against the shoulder 28 of said die which serves as an abutmentfor it to hold it in place against the force of the blows of thehammer-die. In this position one of the prongs 37 lies directly underone of the beveled corner planes 31 of the hammer-die, while the otherprong extends to one side of said die. The treadle being now presseddown, the lifting-pin is relieved of the air, and the pneumatic hammeris operated to cause the hammer-die to deliver a succession of quickblows. The groove 29 of the hammer-die plays down over the shoulder 28of the anvil-die; and the beveled corner plane 31 of the hammer-diestrikes the prong of the tool and swages its surface to an edge. Theoperator by skilful moving of the tool, using theshoulder 28 as afulcrum is able to so change the position of the prong during thisoperation, as to effect the swaging of the prong surface uniformly andin the desired directions. The pressure on the treadle is now relieved,and the hammer-stops, while the lifting-pin is elevated and holds up thehammer-die. The tool is then placed on the other side of the anvil-die,with its other prong in position to be operated upon by the otherbeveled corner plane 31 of the hammer-die; and the operation isrepeated. The hammer being then stopped, the tool is turned with itsprongs in a vertical plane, and is laid on top of the shoulder 28 of theanvil-die, one of its prongs being now presented edgewise under one ofthe beveled planes 34 of the hammer-die, while its other prong entersthe recess 35 above. The hammer being again started, the plane 34: comesdown upon the edge of the prong, throughout its length and well into thecrotch of the prongs, with the result of further swaging the surface ofthe prong and properly drawing it out to a point. In like manner, whenthe tool is turned, the other prong is treated by the other plane 3%. Bythus swaging both horizontally and vertically, the prongs are properlydrawn out to shape and sharpened, the whole operation being quicklydone.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent is 1. In a coal-puncher sharpening-machine, thecombination of an anvil-die formed with flat side planes and anintervening raised shoulder, and a hammer-die formed with a groove inits lower surface to play over the raised shoulder of the anvil-die, thelower surface of said hammer die having at its front portion, on eachside of the groove, upwardly converging planes which intersect theplanes of the bottom and front of the die and the side walls of itsgroove.

2. In a coal-puncher sharpening machine, the combination of an anvil-diehaving a central raised shoulder, and a hammer-die having in its lowersurface a groove to play over the raised shoulder of the anvil-die, theupper wall of said groove having at its forward end forwardly diverging,upwardly converging planes.

- 3. In a coal-puncher sharpening machine, the combination of ananvil-die having a central raised shoulder, and a hammer-die having inits lower surface a groove to play over the raised shoulder of theanvil-die, the upper wall of said 'roove having at its forward endforwardI T diverging, upwardly converging planes, said hammer-die havinga recess in its front above said planes.

1. In a coal-puncher sharpening machine, the combination of an anvil-dieformed with fiat side planes and an intervening raised shoulder, and ahammer-die formed with a groove in its lower surface to play over theshoulder of the anvil-die, the lower surface of said hammer-die havingat its front on each side of its groove upwardly converging planes whichintersect the planes of the bottom and front of the die and the sideWalls of the groove, the upper wall of said groove having at its forwardend forwardly diverging, upwardly converging planes.

5. In a coal-puncher sharpening machine, the combination of an anvil-dieformed with fiat side planes and an intervening raised shoulder, and ahammer-die formed with a groove in its lower surface to play over theshoulder of the anvil-die, the lower surface of said hammer-die havingat its front on each side of its groove upwardly converging planes whichintersect the planes of the bottom and front of the die and the sidewalls of the groove, the upper wall of said groove having at its forwardend forwardly diverging, upwardly converging planes, said hammer-diehaving a recess in its front above said last named planes.

6. In a sharpening machine" of the described class, and in combinationwith an anvil-die, a hammer-die having a rear lug, and a pneumatichammer for operating said hammer-die, a pneumatically operatedlifting-pin acting under the lug of the hammer die to lift and hold saiddie up when the hammer is not operating, and a valve-control foreifecting the alternate operation of said hammer and said lifting pin.

7 In a sharpening machine of the de scribed class, and in combinationwith an anvil-die, a hammer-die having a rear lug, and a pneumatichammer for operating said hammer-die, a pneumatically operatedlifting-pin acting under the lug of the hammer die to lift and hold saiddie up when the hammer is not operating, and a valve-control foreffecting the alternate operation of said hammer and said lifting pin,comprising the valve-casing with an inlet for the compressed air, anoutlet connection for the air to the pneumatic-hammer, an outletconnection for the air to the lifting-pin and an intervening exhaustport, a slidable stem in said casing having a piston on its end, and avalve on said stem disposed to alternately control the two air outletconnections from the casing, said valve having a port arranged toconnect the exhaust port of the casing with the air outlet to thelifting-pin, when the outlet to the pneumatic hammer is open, and toclose the communication between the exhaust port and the outlet to thelifting-pin, when the outlet to the hammer is closed.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

JOHN B. WORD. WILLIAM W. WORD.

Witnesses:

WM. F. BOOTH, D. B. RICHARDS.

